BK_4_ANS.pdf

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Text from the first page

Answers

1
(a) 3 m
(b) 1 m
(d) 342 cm
(e) 496 km
(g) 53
(j) $$ 100$

2
(a) 0,1
(d) 0,8

3
(a) 37
(d) 5.0
g 140
(j 0.030
4 (a) 7580
(d) 1790
(g) 83.4
(j) 8,01
(h) $$ 18$
(e) 7,9
b. 110
e 0.024
h 9.0
b) 52100
e) 0,0892
h: 0,906

Exercise 1a (p. 2)
(c) 86 ha
(f) 165 mm
i 130 litres
$4 \quad 14.1$
$=\quad 24$.
c donte 3
; 85000
i 3.0
(f) 170
(i) 828000
(c) 352000

3
rcise 1b (p. 4)
l (a) $8,5 \mathrm{~cm}$ to 9.5 cm
(b) $1,745 \mathrm{~m}$ to $1,755 \mathrm{~m}$
(c) 6350 km to 6450 km
(d) $9,75 \mathrm{~m}$ to $9,85 \mathrm{~m}$
c 8.5 million to 9,5 million
: - 45 litres to 7,55 litres
g $$ 19500$ to $$ 20500$
(h) $75,55 \mathrm{~kg}$ to $75,65 \mathrm{~kg}$
i. $30,15^{\circ} \mathrm{C}$ to $30,25^{\circ} \mathrm{C}$
(j) $859,5 \mathrm{~cm}^{3}$ to $860,5 \mathrm{~cm}^{3}$

2
(a) $0,667 \%$
(b) $0,83 \%$
(c) $0,4 \%$
(d) $2 \%$
(e) $2,5 \%$
(f) $0,806 \%$
(g) $6,25 \%$
(h) $2,38 \%$

3 (a) $4000 \mathrm{~g}(4 \mathrm{~kg})$
(c) $-3,4 \%$
(i) $1,25 \%$
(j) $5,6 \%$
b. $4140 \mathrm{~g}(4,14 \mathrm{~kg})$

4
(a) $$ 350$
(b) $$ 340,06$
(c) $+2,9 \%$
$5-8,0 \%$
$6102 \mathrm{~g}, 100 \mathrm{~g}$
$7244,8 \mathrm{~kg}, 235,2 \mathrm{~kg}$
8 $6175 \mathrm{~m}^{2}, 7875 \mathrm{~m}^{2}$
9 (a) $11 \pi \mathrm{~cm}, 13 \pi \mathrm{~cm}$
(b) $30 \frac{1}{4} \pi \mathrm{~cm}^{2}, 42 \frac{1}{4} \pi \mathrm{~cm}^{2}$

10 (a) $337,5 \mathrm{~cm}^{2}, 433,5 \mathrm{~cm}^{2}$
(b) $421,875 \mathrm{~cm}^{3}, 614,125 \mathrm{~cm}^{3}$

Exercise 1c
p. 6

1 (a) $1 \frac{3}{4} \mathrm{~h}$
b 60 km h
2 $39000 \mathrm{~cm}^{3}$
3 132 cm
4 a 5.442
(b) 33,236
(c) 14
(d) 0,11

5 (a) 0,095 or 0,10
(b) 0,83 or 0,8
(c) 23

6250 mm to $280 \mathrm{~mm}, 590$ to 670
7 (a) $5,6 \mathrm{~m}$
(b) $5,9 \mathrm{~m}$
$8800 \mathrm{~km} / \mathrm{h}$
$91000 \mathrm{~cm}^{3}$
10 $2800 \mathrm{~cm}^{2}$
Exercise 2a (p. 7)
1 - $\mathrm{XY}=4,1 \mathrm{~cm}, \mathrm{CY}=6,25 \mathrm{~cm}$
2 d a rhombus
(e) $11,9 \mathrm{~cm}, 3,3 \mathrm{~cm}$
(b) 2100000 (true value is 2141872 )

9
(a) 28
(b) 300
(c) 900
(d) 0,002

10
(a) 34,62
(b) 327,9
(c) 742,8
(d) 0,002135

Exercise 1b (p. 4)
(a) $8,5 \mathrm{~cm}$ to 9.5 cm " (b) 75101 "
$5 $ 389$ million. $$ 390$ million, Almost $$ 400$ million. $$ 0,39$ billion

6

\begin{table}
\captionsetup{labelformat=empty}
\caption{(a)}

 town  |  population
 Bulawayo  |  5
 Chitungwiza  |  200000
 Harare  |  7000000

\end{table}

\begin{table}
\captionsetup{labelformat=empty}
\caption{(b)}

 town  |  population
 Bulawayo  |  500000
 Chitungwiza  |  170000
 Harare  | …